Determination of Current Density Suppression Ability of Poly(ethylene glycol) during Copper Electrodeposition by an Electrochemical Analysis with a Microfluidic Device and an Electrochemical Quartz Crystal Microbalance
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概要
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The adsorption behaviour of poly(ethylene glycol) (PEG) as an additive during Cu electrodeposition was investigated using a microfluidic device. First, the current density (i) transition curves were measured by rapid exchange from the base electrolyte to electrolytes with different concentrations of additive PEG. Then, the effective surface coverage ratio (\theta_{\text{EFF}}) of the electrodes by PEG was obtained. Equations relating \theta_{\text{EFF}} and the PEG adsorption rate constant (k_{\text{a}}) as a function of c_{\text{PEG}} (or PEG flux, u\cdot c_{\text{PEG}}) were determined from the PEG concentration (c_{\text{PEG}}) and average flow velocity of the electrolyte (u) dependency. Finally, the amount of increase the weight on the electrode (\Delta m) by PEG for different c_{\text{PEG}} was measured using a flow cell type electrochemical quartz crystal microbalance (EQCM), and then used to calculate \theta_{\text{EFF}}, assuming the adsorbed PEG molecules are spherical. Results revealed a strong correlation between the \Delta m and a decrease in i.
- 2013-05-25
著者
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Saito Takeyasu
Department Of Chemical Engineering Faculty Of Engineering The University Of Tokyo
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Kondo Kazuo
Department Of Applied Chemistry Okayama University
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Okamoto Naoki
Department Of Applied Chemistry Graduate School Of Engineering Osaka University
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Tsujimoto Yuichi
Department of Pathology, Osaka Medical Center for Cancer and Cardiovascular Diseases
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Miyamoto Yutaka
Department of Chemical Engineering, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan
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Kondo Kazuo
Department of Chemical Engineering, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan
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